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Energy on All Scales

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Energy on All Scales European Summer Campus 2013 Strasbourg Energy on all scales Joël Pouthas Laboratoire de Physique Corpusculaire ENSICAEN, Caen, France [email protected] European Summer Campus 2013 Strasbourg What is energy ? Lectures Richard on Feynman Physics Summer Science Program 1960 European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN European Summer Campus 2013 Strasbourg Energy, the rise of a concept Part I – Historical sketch English: energy French: énergie German: energie Italian: energia Greek: ἐνέργεια , energeia Latin: energia European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN Origins in Physics (Natural Philosophy) Outlines of the Science of Energetics Read before the Philosophical Society of Glasgow on May 2, 1855 On the phrase “Potential Energy”, and on the Definitions of Physical Quantities Read before the Philosophical Society of Glasgow on January 23, 1867 W. J. M. Rankine (1820 – 1872) 1807 Miscellaneous Scientific Papers by W. J. Macquorn Rankine London, Charles Griffin and Company, 1881 European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN Origins in Physics (Natural Philosophy) Late introduction of the word “Energy” in physics (Nineteenth century) … but Notions of “force”, “work”, “”vis viva” already used in Mechanics Capacity of performing work Steam engines (Development in eighteen century) Mid-nineteenth century Development of “Thermodynamics” Relations between “heat” and “work” European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN Thermodynamics Mid Nineteenth Century William Thomson Rudolf Clausius (1824 – 1907) (1822 – 1888) European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN Thermodynamics - Clausius 1822 Born in Pomerania (Prussia) 1844 Graduate From University of Berlin 1848 Doctorate from University of Halle (Reflected light in the sky) 1850 Professor at Berlin (Royal Artillery School) 1855 Chair of Mathematical Physics at ETH Zurich 1867 University of Würzburg 1869 University of Bonn (Rector in 1884 and 1885) 1888 Died in Bonn On the motive power of heat and on the laws which 1850 can be deduced from it for the theory of heat* I. Consequences of the principle of the equivalence of heat and work II. Consequences of Carnot’s principle in connection with the one already introduced *Ueber die bewegende Kraft der Wärme und die Gesetze, welche sich daraus für die Warmelehre selbst ableitenlassen (Annalen der Physik und Chemie) European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN Equivalence of Heat and Work Several actors in the 1840s “Work” “Force” “Power” “Energy” “Precursors” - Benjamin Thompson (Count Rumford) (1753 – 1814) American-born. England. Bavaria. France. Interest in gunnery and explosives An Experimental Enquiry Concerning the Source of the Heat which is Excited by Friction (1798) - Karl Friedrich Mohr (1806 – 1879) German chemist Uber die Natur der Wärme (1837) Transformation of “Kraft” Julius Robert von Mayer German physician and natural philosopher (1814 - 1878) Travel on boat as a ship’s doctor. Idea of equivalence of heat and work (1840) 4 papers: 1 rejected (1841) 1 published (1842) 2 printed at his own expense (1845 and 1848) No personal experiment but use of existing results to obtain the First figure for equivalence between heat and work European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN Equivalence of Heat and Work Several actors in the 1840s “Work” “Force” “Power” “Energy” James Prescott Joule English brewer and physicist (1818 - 1889) Interest in electricity (Heat and current => Joule’s law) On the Mechanical Equivalent of heat (1845 and 1847) (Reports of the British Association for the advancement of Science) On the Mechanical equivalent of Heat Philos.Trans. Royal Society 1849 Joule (1818 – 1889) To day The joule (J) is the Unit of Energy 2 2 Apparatus 1 J = 1 kg. m / s Science Museum, London European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN Equivalence of Heat and Work Several actors in the 1840s “Work” “Force” “Power” “Energy” “Others” - Ludwig August Colding (1815 - 1888) Danish civil engineer and physicist - Gustave-Adolphe Hirn (1815 - 1890) French manufacturer and physicist Hermann von Helmholtz German physiologist and physicist (1821 - 1894) On the Conservation of Force (1847) Über die Erhaltung der Kraft Considerations on heat and human action versus the impossibility of perpetual motion Formulation of the concept of “Conservation (Erhaltung)” in the framework of mechanics European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN Carnot’s principle ? Sadi Carnot 1796 Born in Paris (Son of Lazare Carnot) 1812 Ecole Polytechnique 1814 Ecole de Metz and (weak) military activities 1819 Paris (General Staff). Personal works 1828 Retired (without pension) from the army 1832 Died of cholera In 1813 by Louis-Léopold Boilly European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN Carnot’s principle ? 1824 In 1813 by Louis-Léopold Boilly Reflexions on the Motive power of fire and on machines fitted to develop that power European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN Carnot’s principle ? 1824 In 1813 by Louis-Léopold Boilly European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN Steam engines – Historical roots Condensation of hot steam -> Production of a partial vacuum in a vessel ~ 1700 Piston in a cylinder : Denis Papin (1647 – 1712) 1698 “Fire engine” by Thomas Savery (1650 – 1715) Pumping water in mines (only few samples) 1712 Engine by Thomas Newcomen (1654 – 1729) Pumping water in mines (Savery’s patent) ~ 75 engines on 1730 “Atmospheric condensing engine” The “motive power” is the Atmospheric pressure European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN Steam engines - Watt Work on the Newcomen engine (Model, economy) -> 1765 Introduction of the Condenser James Watt (1736 – 1819) X Immersion of the condenser in cold water European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN Steam engines - Watt Other improvements: Sealing the top of the cylinder and injection of steam on the upper part Etc… Matthew Boulton (1728 – 1809) James Watt (1736 – 1819) Engineer Manufacturer 1774 Final quarter of the 18th century European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN Steam engines - Industrialisation Stephenson - 1829 Trevithick - 1803 European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN Steam engines - Industrialisation Ebley Cloth Mills, Gloucestershire c.1850 Painting by Alfred Newland Smith European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN “Carnot cycle” 1824 S. Carnot Reflexions on the motive power of fire and on machines fitted to develop that power European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN Carnot’s work 1824 S. Carnot Reflexions on the motive power of fire and on machines fitted to develop that power 1834 E. Clapeyron Mémoire sur la puissance motrice de la chaleur Journal de L’Ecole Polytechnique (Memoir on the motive power of heat) Carnot cycle Modern representation on a pressure-volume graph (Not in the Carnot treatise) Emile Clayperon (1799 – 1864) European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN Legacy of the Carnot’s work 1824 S. Carnot Reflexions on the motive power of fire and on machines fitted to develop that power (French) 1834 E. Clapeyron Memoir on the motive power of heat (French) Translations English 1837 German 1843 1848 W.Thomson On an Absolute Thermometric Scale founded on Carnot’s Theory of the Motive Power of Heat, and calculated from Regnault’s observations (English) 1849 W.Thomson An Account of Carnot’s Theory of the Motive Power of Heat with Numerical Results deduced from Regnault’s Experiments on Steam (English) 1850 R. Clausius On the motive power of heat and on the laws which can be deduced from it for the theory of heat (German) European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN Thermodynamics - Thomson 1822 Born at Belfast 1833 Family moved to Glasgow 1845 High level graduation (Mathematics) at Cambridge 1846 Professor at Glasgow (Natural Philosophy) 1892 Baron Kelvin of Largs (Knighted in 1866) 1907 Died at Largs, Scotland European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN Thermodynamics - Clausius 1850 On the motive power of heat and on the laws which can be deduced from it for the theory of heat I. Consequences of the principle of the equivalence of heat and work II. Consequences of Carnot’s principle in connection with the one already introduced 1854 On another form of the second law of the mechanical theory of heat Zweite Haupsatze Satz von der Aequivalenz der Verwandlungen der mechanishen Warmetheorie (“Principle” of the equivalence of transformations) (Second “main proposition” of the mechanical theory of heat) For all the reversible close cycles, the analytical expression of the second law of the mechanical theory of heat is: ∫dQ/T = 0 European Summer Campus 2013, Strasbourg Joël Pouthas LPC - ENSICAEN Thermodynamics - Clausius 1850 On the motive power of heat and on the laws which can be deduced from it for the theory of heat 1854 On another form of the second law of the mechanical theory of heat 1862 On the application of the principle of the equivalence of transformations to internal work 1865 On several convenient forms of the fundamental equations of the mechanical theory of heat On a reversible cycle : “Equivalence of transformation” ∫dQ/T = S - S0 “I propose to name the quantity S the entropy of the system,
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